Pull out the foam plug at the top and look down the pylon - if it's there, it's held in with polyurethane foam (you know the 2 part liquid that turns to foam when mixed? - kinda like the "Great Stuff" foam that you can buy in a spray can at Home Depot these days). It will be very obvious it's there because the foam will have expanded halfway up the pylon.

I used a long (18") drill bit to kind of chip it out. Be real careful not to go through the bottom of the boat.

I just bought an '85 red glue seam Hobie 14. I already know it weighs 8 lbs less than minimum (but without a dolphin striker, trapeze or sidebar carpet). It'll be interesting to see if there's lead in the pylons. I think they had stopped doing that by '85.